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a 958-m ladder with a mass of 222 kg lies flat on the ground a painter grabs the top end of the ladder and pulls
a camera lens usually consists of a combination of two or more lenses to produce a good-quality image suppose a camera
an automobile has a 24 watt reading lamp in the ceiling of the carif it is attached to the 12 volt car battery how much
at normal incidence the intensity of sunlight at the earth is 1400 wm2 assume for simplicity that all of the incident
a rectangular loop is made up of 50 turns of wire and has dimensions of 45 x 55 cm it is located in a uniform 2 t
a block of mass m135kg moves with velocity v163ms on a frictionless sufaceit collides with block of mass m217kg which
a laser is used in eye surgery to weld a detached retina back into place the wavelength of the laser beam is 511 nm
you have a 200 resistor a 0400 h inductor a 500 f capacitor and a variable-frequency ac source with an amplitude of 300
a 150 ohm resistor is connected in series with a 0250 h inductor the voltage across the resistor is vr 380 cos 720t
the bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 145 of what would be found
a wheel is rotating freely with an angular speed of 20 rads on a shaft whose moment of inertia is negligible a second
a 1200 car is moving on the freeway at 600 what is the magnitude of its momentum in si units what is the magnitude of
a quasars spectrum shows a shift in spectral lines of 0158 use the doppler-shift formula to determine what recession
a galaxy has a rotation speed of 200 kilometers per second at a distance from its center of 10 kiloparsecs what is its
a an ideal gas occupies a volume of 30 cm3 at 20degc and atmospheric pressure determine the number of molecules of gas
a steel wire with mass 255 g and length 116 m is strung on a bass so that the distance from the nut to the bridge is
when a tuning fork of frequency 360 hz is held above a tube filled with water the resonances are found when the water
to determine the specific heat of an object a student heats it to 100 degrees c in boiling water she then places the
a string 19 m long with a mass of 26 g is stretched between two fixed points with a tension of 80 nfind the frequency
a piano tuner stretches a steel piano wire with a tension of 765 n the steel wire has a length of 0900 m and a mass of
a pair of in-phase stereo speakers is placed side by side 080 m apart you stand directly in front of one of the
a satellite of the earth has a mass of100kg and is at an altitude of100multiplied by106ma what is the gravitational
how much energy is required to move a600kg object from the earths surface to an altitude twice the earths
at the earths surface a projectile is launched straight up at a speed of105kms to what height will it rise ignore air
a 5kg ball moving to the right at 6ms strikes a 3kg initially at rest the 5kg ball continues moving in the same